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89 lines
3.0 KiB
C++
89 lines
3.0 KiB
C++
//
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// @@ All Rights Reserved @@
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// This file is part of the RDKit.
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// The contents are covered by the terms of the BSD license
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// which is included in the file license.txt, found at the root
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// of the RDKit source tree.
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//
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// Original author: David Cosgrove (CozChemIx) on 29/04/2020.
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//
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#include <GraphMol/MolDraw2D/DrawTextCairo.h>
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#include <GraphMol/MolDraw2D/MolDraw2D.h>
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using namespace std;
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namespace RDKit {
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// ****************************************************************************
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DrawTextCairo::DrawTextCairo(double max_fnt_sz, double min_fnt_sz,
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cairo_t *dp_cr)
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: DrawText(max_fnt_sz, min_fnt_sz), dp_cr_(dp_cr) {
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cairo_select_font_face(dp_cr, "sans", CAIRO_FONT_SLANT_NORMAL,
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CAIRO_FONT_WEIGHT_NORMAL);
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cairo_set_font_size(dp_cr, fontSize());
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}
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// ****************************************************************************
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// draw the char, with the bottom left hand corner at cds
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void DrawTextCairo::drawChar(char c, const Point2D &cds) {
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PRECONDITION(dp_cr_, "no draw context");
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cairo_set_font_size(dp_cr_, fontSize());
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DrawColour col = colour();
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cairo_set_source_rgb(dp_cr_, col.r, col.g, col.b);
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char txt[2];
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txt[0] = c;
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txt[1] = 0;
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cairo_move_to(dp_cr_, cds.x, cds.y);
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cairo_show_text(dp_cr_, txt);
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cairo_stroke(dp_cr_);
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}
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// ****************************************************************************
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void DrawTextCairo::getStringRects(const string &text,
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vector<shared_ptr<StringRect>> &rects,
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vector<TextDrawType> &draw_modes,
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vector<char> &draw_chars) const {
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TextDrawType draw_mode = TextDrawType::TextDrawNormal;
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double running_x = 0.0;
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char char_str[2];
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char_str[1] = 0;
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double max_y = 0.0;
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double full_fs = fontSize();
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for (size_t i = 0; i < text.length(); ++i) {
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// setStringDrawMode moves i along to the end of any <sub> or <sup>
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// markup
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if ('<' == text[i] && setStringDrawMode(text, draw_mode, i)) {
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continue;
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}
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draw_chars.push_back(text[i]);
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char_str[0] = text[i];
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cairo_text_extents_t extents;
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cairo_set_font_size(dp_cr_,
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selectScaleFactor(text[i], draw_mode) * full_fs);
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cairo_text_extents(dp_cr_, char_str, &extents);
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cairo_set_font_size(dp_cr_, full_fs);
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double twidth = extents.width;
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double theight = extents.height;
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Point2D offset(extents.x_bearing + twidth / 2.0, -extents.y_bearing / 2.0);
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Point2D g_centre(offset.x, -extents.y_bearing - theight / 2.0);
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rects.push_back(shared_ptr<StringRect>(
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new StringRect(offset, g_centre, twidth, theight)));
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rects.back()->trans_.x = running_x;
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draw_modes.push_back(draw_mode);
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running_x += extents.x_advance;
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max_y = max(max_y, -extents.y_bearing);
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}
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for (auto r : rects) {
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r->g_centre_.y = max_y - r->g_centre_.y;
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r->offset_.y = max_y / 2.0;
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}
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adjustStringRectsForSuperSubScript(draw_modes, rects);
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}
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} // namespace RDKit
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